To remove restrictions from something; to lift limitations or controls that were previously imposed.
From de- (remove) + restrict (from Latin restrictus, held back). This modern term gained prominence in the 1980s-90s with discussions of deregulation and removing speed limits.
When the Autobahn removed speed limits on certain sections, that was 'derestriction'—and studies show that surprisingly, fatality rates didn't increase as much as expected, confounding predictions!
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